Navigating planning delays: how developers can protect project timelines

Planning delays are a fact of UK development life. But developers who treat them as unpredictable stand to lose far more than those who plan around them from day one.

If you have worked in UK commercial development in recent years, you will recognise the pattern. A scheme gets approval, in principle, and then the pre-commencement conditions stack up. Discharge of planning conditions takes months longer than projected. Technical consultees are slow to respond. And before long, the programme is already slipping before a contractor has been appointed, let alone mobilised.

Planning delay is not new. But its scale and its impact on development economics have worsened. The Federation of Master Builders and CIOB’s 2025 State of Trade Survey found that 38% of firms experiencing delays identified planning as the primary cause. For commercial developers, that figure translates directly into carrying costs, extended financing periods, and delayed revenue.

Why the planning system is slower than it looks

Government statistics on planning decision times can appear reassuring; 87% of minor applications are determined within eight weeks, for instance. But as the sector knows, those figures include extensions of time agreed between applicants and local planning authorities. When an LPA asks for more time, and the developer agrees, the decision clock resets. The official statistics rarely reflect the real-world experience of waiting.

Resourcing at many LPAs remains constrained despite a 2025 planning fee increase. The government has committed to hiring 300 additional planning officers nationally — a significant step, but one that will take years to work through the system. In the meantime, commercial and public sector schemes continue to face unpredictable timetables between application, decision, and consent implementation.

The cost of under-planning the pre-commencement phase

Developers who treat the period between planning consent and start on site as administrative time, rather than programme time, tend to be the ones who end up surprised. Discharging pre-commencement conditions, agreeing construction management plans, satisfying highway and drainage conditions, and completing Section 278 agreements all take time. On a large commercial or public sector scheme, that process alone can run to six months or more.

Planning consent is not a start on site. Between the two sits a programme in its own right — and it needs to be managed like one.

Wakemans’ project management team builds pre-commencement programmes that treat condition discharge as a critical path activity, not an afterthought. On public sector and commercial schemes, where political deadlines and funding drawdown windows add further pressure, that approach has repeatedly made the difference between schemes that proceed on time and those that don’t.

Practical steps to protect your programme

• Appoint the PM team before planning is granted. The pre-commencement phase needs the same level of coordination as the construction phase. Waiting until consent is in hand to appoint a project manager means the programme has already been compressed.
• Map your pre-commencement conditions at the outset. For each condition, identify the consultee, the likely timeframe for response, and the dependencies between conditions. This transforms an unpredictable queue into a managed schedule.
• Budget for delay contingency, not optimism. Construction output price indices rose 2.7% in the year to December 2025 (ONS). Every week of delay on a commercial scheme accumulates finance costs, extended professional fees, and potential contractor repricing.

The developers who navigate the planning environment most effectively are not the ones who avoid delays — they are the ones who see them coming and have already planned around them. Wakemans provides project management services across commercial and public sector development, from pre-planning to handover. Speak to our team about your upcoming scheme and to ensure expert advice from inception.

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